IfthereisasingleconceptthatisthedriverofmuchoftheInternet'sgrowthoverthepastdecade–nottomentionnearlyallofGoogle'sannualrevenueof$25billion–itistheconceptofkeywords.Keywordsarewhatwetypeinwhenwearesearchingforproducts,services,andanswersonthesearchengines,anactthatAmericansperformed15.5billiontimesinApril2010accordingtoComScore,thewebresearchfirm.Companiesoptimizetheirwebpages...